Help me with sorting the curves from a path file

Hi,

I'm newly in GH, I've done some things, but I can't do this (I search a lot on this forum, but ...nothing):

I have:

- a folder with Rhino files with a curve in each file

- in GH I have: Path -> Import 3DM -> Boundary Surfaces -> ... etc.

- in Path I have the list of Rhino files

First of all I want:

- make a surface, but to change directly onto GH the geometry selecting different curved (different file from folder)

I can't do:

- a filter for selecting the Rhino file (for the moment I have all the surfaces from all curves).

Please help.

Thanks.